Microbicidal composition

Abstract

A microbicidal composition comprising relatively high levels of a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one; a metal nitrate; and water. The composition optionally contains magnesium chloride.

1. A microbicidal composition comprising:
 (a) 27-37% of a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one in which the weight ratio of 5-chloro-2-methyl-4-isothiazolin-3-one to 2-methyl-4-isothiazolin-3-one is from 4:1 to 1:1; 
 (b) 12-27% of a metal nitrate; 
 (c) 35-50% water; and 
 (d) 9-12% magnesium chloride; 
 
       wherein the composition is substantially free of bromic acid, iodic acid, periodic acid or their salts. 
     
     
       2. The composition of  claim 1  having 27-35% of a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, 38-50% water and 15-22% of a metal nitrate.